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Why Does the Fork Vibrate?-100 Questions About Tuning Fork Level Switches

2026-09-22

12. Why Does the Fork Vibrate?

The fork vibrates because of a piezoelectric crystal element built inside the sensor housing.
Piezoelectric materials produce mechanical deformation when an electrical voltage is applied. The transmitter circuit sends alternating electrical signals to the piezo element. The piezo crystal expands and contracts rapidly under the alternating voltage, and this mechanical motion drives the fork prongs to oscillate at their natural resonant frequency.
As long as the fork is uncovered, the circuit keeps maintaining this stable vibration.
Simply put: Electric signal → piezo crystal shakes → fork vibrates.

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